Stock Based Compensation - Additional Information (Detail) - USD ($) |
3 Months Ended | 6 Months Ended | ||
---|---|---|---|---|
Jun. 30, 2018 |
Jun. 30, 2017 |
Jun. 30, 2018 |
Jun. 30, 2017 |
|
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract] | ||||
Stock-based compensation expense | $ 922,000 | $ 25,000 | $ 1,565,000 | $ 52,000 |
Unrecognized compensation cost related to unvested stock-based awards granted to employees under the equity incentive plans | 16,000,000 | $ 16,000,000 | ||
Unrecognized compensation cost related to unvested stock-based awards granted to employees under the equity incentive plans, period for recognition | 3 years 4 months 24 days | |||
Total intrinsic value of stock options exercised | 30,000 | $ 1,600,000 | ||
Cash received from stock option exercises | $ 8,000 | $ 0 | 156,000 | $ 0 |
Tax benefit realized upon exercise of option | $ 0 |
X | ||||||||||
- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
X | ||||||||||
- References No definition available.
|
X | ||||||||||
- Definition Unrecognized cost of unvested share-based compensation awards. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
X | ||||||||||
- Definition Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
X | ||||||||||
- Definition Amount of tax benefit from exercise of stock options granted under share-based compensation arrangement. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
X | ||||||||||
- Definition Amount of cash inflow from exercise of stock options granted under share-based compensation arrangement. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
X | ||||||||||
- Definition Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|