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Stock-Based Compensation - Summary of Stock Option Activity (Details)
 3 Months Ended
Mar. 31, 2021
$ / shares
shares
2010 Plan Activity [Member]  
Shares available for grant options, beginning of period
Shares available for grant options RSUs vested
Shares available for grant options RSUs granted
Shares available for grant options granted
Shares available for grant options exercised
Shares available for grant options forfeited, cancelled and expired
Shares available for grant outstanding, end of period
Number of options outstanding, beginning of period 1,218,000
Number of options outstanding, options exercised (90,000)
Number of options outstanding, options forfeited, cancelled and expired
Number of options outstanding, end of period 1,128,000
Number of options outstanding, exercisable, end of period 1,081,000
Weighted average exercise price, options outstanding, beginning of period | $ / shares $ 3.55
Weighted average exercise price, options exercised | $ / shares 2.09
Weighted average exercise price, options forfeited, cancelled and expired | $ / shares
Weighted average exercise price, outstanding end of period | $ / shares 3.65
Weighted average exercise price, exercisable, end of period | $ / shares $ 3.76
2018 Incentive Plan Activity [Member]  
Shares available for grant options, beginning of period 3,346,000
Shares available for grant options RSUs vested
Shares available for grant options RSUs granted
Shares available for grant options granted (2,966,000)
Shares available for grant options exercised
Shares available for grant options forfeited, cancelled and expired 76,000
Shares available for grant outstanding, end of period 456,000
Number of options outstanding, beginning of period 7,212,000
Number of options outstanding, option granted 2,966,000
Number of options outstanding, option RSUs vested
Number of options outstanding, option RSUs granted
Number of options outstanding, options exercised (195,000)
Number of options outstanding, options forfeited, cancelled and expired (76,000)
Number of options outstanding, end of period 9,907,000
Number of options outstanding, exercisable, end of period 2,849,000
Weighted average exercise price, options outstanding, beginning of period | $ / shares $ 2.60
Weighted average exercise price, option granted | $ / shares 5.12
Weighted average exercise price, option RSUs vested | $ / shares
Weighted average exercise price, option RSUs granted | $ / shares
Weighted average exercise price, options exercised | $ / shares
Weighted average exercise price, options forfeited, cancelled and expired | $ / shares 2.69
Weighted average exercise price, outstanding end of period | $ / shares 3.35
Weighted average exercise price, exercisable, end of period | $ / shares $ 2.67
Number of RSUs Outstanding, beginning of period 201,000
Number of RSUs Outstanding, option granted
Number of RSUs Outstanding, option RSUs vested
Number of RSUs Outstanding, option RSUs granted
Number of RSUs Outstanding, options exercised
Number of RSUs Outstanding, options forfeited, canceled and expired
Number of RSUs Outstanding, end of period 201,000