Annual report pursuant to Section 13 and 15(d)

Stock-based Compensation - Summary of Stock Option Activity (Details)

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Stock-based Compensation - Summary of Stock Option Activity (Details) - 2014 Equity Incentive Plan
$ / shares in Units, shares in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2019
USD ($)
$ / shares
shares
Options Outstanding  
Outstanding at beginning of year (in shares) | shares 6,466
Granted (in shares) | shares 2,414
Exercised (in shares) | shares (186)
Forfeited (in shares) | shares (846)
Expired (in shares) | shares (437)
Outstanding at end of year (in shares) | shares 7,411
Vested and expected to vest (in shares) | shares 7,411
Exercisable at year end (in shares) | shares 3,258
Weighted Average Exercise Price  
Outstanding at beginning of year (in dollars per share) | $ / shares $ 3.05
Granted (in dollars per share) | $ / shares 0.85
Exercised (in dollars per share) | $ / shares 1.23
Forfeited (in dollars per share) | $ / shares 2.02
Expired (in dollars per share) | $ / shares 3.94
Outstanding at end of year (in dollars per share) | $ / shares 2.44
Vested and expected to vest (in dollars per share) | $ / shares 2.44
Exercisable at year end (in dollars per share) | $ / shares $ 3.86
Weighted Average Remaining Contractual Life (Years), Ending Balance 8 years 29 days
Weighted Average Remaining Contractual Life (Years), Vested and expected to vest 8 years 29 days
Weighted Average Remaining Contractual Life (Years), Exercisable 6 years 3 months 22 days
Aggregate Intrinsic Value, Ending Balance | $ $ 0
Aggregate Intrinsic Value, Vested and expected to vest | $ 0
Aggregate Intrinsic Value, Exercisable | $ $ 0