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Stockholders' Equity and Stock-based Compensation - Schedule of Stock Option Plan Activity (Details)
$ / shares in Units, $ in Thousands
 9 Months Ended
Sep. 30, 2018
USD ($)
$ / shares
shares
Weighted Avg. Exercise Price, Exercisable Ending Balance $ 5.10
Stock Option Plan [Member]  
Number of shares, Outstanding, Beginning balance | shares 2,259,979
Number of shares, Options granted | shares 295,000
Number of shares, Options exercised | shares
Number of shares, Options cancelled/forfeit | shares (29,974)
Number of shares, Outstanding, Ending balance | shares 2,525,005
Number of shares, Options exercisable | shares 1,277,557
Number of shares, Options vested and expected to vest | shares 2,396,105
Weighted Avg. Exercise Price, Outstanding, Beginning balance $ 5.51
Weighted Avg. Exercise Price, Options granted 1.79
Weighted Avg. Exercise Price, Options exercised
Weighted Avg. Exercise Price, Options cancelled/forfeit 3.36
Weighted Avg. Exercise Price, Outstanding, Ending balance 5.10
Weighted Avg. Exercise Price, Exercisable Ending Balance 5.12
Weighted Avg. Exercise Price, Vested and expected to vest $ 5.10
Weighted Avg. Remaining Contractual Life, Options outstanding 5 years 9 months 14 days
Weighted Avg. Remaining Contractual Life, Options exercisable 6 years 2 months 19 days
Weighted Avg. Remaining Contractual Life, Options vested and expected to vest 5 years 9 months 18 days
Aggregate Intrinsic Value, Options outstanding | $ $ 631
Aggregate Intrinsic Value, Options exercisable | $ 258
Aggregate Intrinsic Value, Options vested and expected to vest | $ $ 585