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Stock-Based Compensation - Schedule of Stock Options Activity (Details)
$ / shares in Units, shares in Thousands, $ in Thousands
 9 Months Ended
Sep. 30, 2018
USD ($)
$ / shares
shares
Number of Shares  
Balance outstanding at beginning of period, (in shares) | shares 3,558
Forfeited or expired, (in shares) | shares (50)
Exercised (in shares) | shares (5)
Balance outstanding at end of period, (in shares) | shares 3,503
Exercisable, (in shares) | shares 3,116
Vested and expected to vest, (in shares) | shares 3,441
Weighted Average Exercise Price  
Balance outstanding at beginning of period, (in dollars per share) | $ / shares $ 2.09
Forfeited or expired, (in dollars per share) | $ / shares 0
Exercised (in dollars per share) | $ / shares 0
Balance outstanding at end of period, (in dollars per share) | $ / shares 2.08
Exercisable, (in dollars per share) | $ / shares 2.22
Vested and expected to vest, (in dollars per share) | $ / shares $ 2.10
Weighted Average Remaining Term  
Balance outstanding 3 years 7 months 20 days
Exercisable 3 years 1 month 9 days
Vested and expected to vest 3 years 6 months 21 days
Aggregate Intrinsic Value  
Balance outstanding | $ $ 131
Exercisable | $ 80
Vested and expected to vest | $ $ 122