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Stock-Based Compensation - Summary of Stock Option and PRSU Activity (Details) - Stock Option and PRSU [Member] - USD ($) | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Shares Issuable Under Options and PRSU |  |  |
Outstanding, beginning balance | 974,817 | 782,340 |
Granted | 815,400 | 267,950 |
Exercised |  | (15,120) |
PRSUs vested | (78,450) |  |
Forfeited / Canceled | (11,500) | (60,353) |
Outstanding, ending balance | 1,700,267 | 974,817 | 782,340
Stock awards vested and expected to vest as of December 31, 2019 | 1,645,267 |  |
Options exercisable as of December 31, 2019 | 882,576 |  |
Weighted Average Exercise Price |  |  |
Outstanding, beginning balance | $ 12.31 | $ 14.28 |
Granted | 1.75 | 5.02 |
Exercised |  | 4.74 |
PRSUs vested | 4.83 |  |
Forfeited / Canceled | 4.41 | 7.31 |
Outstanding, ending balance | 7.64 | $ 12.31 | $ 14.28
Stock awards vested and expected to vest as of December 31, 2019 | 7.64 |  |
Options exercisable as of December 31, 2019 | $ 12.49 |  |
Weighted Average Remaining Contractual Term (In years) |  |  |
Outstanding as of January 1, 2018 | 8 years 2 months 12 days | 8 years 2 months 12 days | 8 years 9 months 18 days
Stock awards vested and expected to vest as of December 31, 2019 | 8 years 2 months 12 days |  |
Options exercisable as of December 31, 2019 | 7 years 3 months 18 days |  |
Aggregate Intrinsic Value |  |  |
Aggregate intrinsic value, Outstanding |  |  | $ 8,500

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