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Fair value of the assets less the liabilities of a derivative or group of derivatives.

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Derivative Liabilities and Fair Value Measurements - Additional Information (Details) - USD ($) $ / shares in Units, $ in Thousands	Mar. 31, 2020	Dec. 31, 2019	Jun. 04, 2019	Mar. 19, 2019
Warrants to purchase shares of common stock			1,374,750	1,942,131
Derivative liability	$ 6,428	$ 3,137
B3D Conversion Option
Derivative liability	3,457	382
Calm Conversion Option
Derivative liability	$ 550	1,761
Calm Warrants
Exercise price per warrant	$ 0.525
Derivative liability	$ 123	$ 216
Warrants
Derivative, fair value, net	$ 0