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Warrants
 6 Months Ended
Jun. 30, 2020
Warrants and Rights Note Disclosure [Abstract]  
Warrants Warrants
Below is a summary of the number of shares issuable upon exercise of outstanding warrants and the terms and accounting treatment for the outstanding warrants (in thousands, except per share data):
 Warrants as of   
   Weighted-
Average
Exercise		 Balance Sheet
Classification
 June 30, 2020December 31, 2019Price Per
Share		ExpirationJune 30, 2020December 31, 2019
Warrants to purchase common stock39  39  $5.88  July 9, 2020LiabilityLiability

All remaining outstanding warrants were automatically cashless exercised in full upon their expiration on July 9, 2020.