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Stock-Based Compensation - Schedule of Stock Options Activity (Details)
shares in Thousands
 3 Months Ended
Mar. 31, 2019
$ / shares
shares
Number of Shares  
Balance outstanding at beginning of period, (in shares) | shares 3,201
Forfeited or expired, (in shares) | shares (20)
Exercised (in shares) | shares (4)
Balance outstanding at end of period, (in shares) | shares 3,177
Exercisable, (in shares) | shares 2,894
Vested and expected to vest, (in shares) | shares 3,144
Weighted Average Exercise Price  
Balance outstanding at beginning of period, (in dollars per share) | $ / shares $ 2.18
Forfeited or expired, (in dollars per share) | $ / shares 3.12
Exercised (in dollars per share) | $ / shares 0.78
Balance outstanding at end of period, (in dollars per share) | $ / shares 2.18
Exercisable, (in dollars per share) | $ / shares 2.30
Vested and expected to vest, (in dollars per share) | $ / shares $ 2.19
Weighted Average Remaining Term  
Balance outstanding 3 years 5 months 23 days
Exercisable 3 years 1 month 2 days
Vested and expected to vest 3 years 5 months 8 days