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Stock-based Compensation - Stock Option Activity (Details)
 6 Months Ended
Jun. 30, 2020
USD ($)
$ / shares
shares
Options [Roll Forward]  
Balance as of December 31, 2019 (in share) | shares 1,865
Common stock shares to be issued (in shares) | shares 530,000
Cancelled/forfeited (in share) | shares (124)
Balance as of June 30, 2020 (in share) | shares 531,741
Vested as of June 30, 2020 | shares 1,143
Vested and expected to be vested as of June 30, 2020 | shares 531,741
Weighted Average Exercise Price [Roll Forward]  
Balance as of December 31, 2019 (in dollars per share) | $ / shares $ 2,968.22
Granted (in dollars per share) | $ / shares 2.12
Cancelled/forfeited (in dollars per share) | $ / shares 9,905.00
Balance as of June 30, 2020 (in dollars per share) | $ / shares 10.24
Vested as of June 30, 2020 | $ / shares 3,663.00
Vested and expected to be vested as of June 30, 2020 | $ / shares $ 10.24
Aggregate Intrinsic Value [Roll Forward]  
Vested and expected to be vested as of June 30, 2020 | $ $ 8,480