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Stock-based Compensation - Stock Option Activity (Details)
 12 Months Ended
Dec. 31, 2019
$ / shares
shares
Options [Roll Forward]  
Balance as of December 31, 2018 (in shares) | shares 2,752
Granted (in shares) | shares 2,800
Expired (in shares) | shares (37)
Cancelled/forfeited (in shares) | shares (3,650)
Balance as of December 31, 2019 (in shares) | shares 1,865
Weighted Average Exercise Price [Roll Forward]  
Balance as of December 31, 2018 (in dollars per share) | $ / shares $ 4,003.50
Granted (in dollars per share) | $ / shares 15.69
Expired (in dollars per share) | $ / shares 41,692.00
Cancelled/forfeited (in dollars per share) | $ / shares 1,089.35
Balance as of December 31, 2019 (in dollars per share) | $ / shares $ 2,968.22