The Company - Additional Information (Details) - USD ($) $ / shares in Units, $ in Thousands, shares in Millions		3 Months Ended
	Jan. 06, 2021	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Class of Stock [Line Items]
Entity incorporation date		May 26, 2011
Cash and cash equivalents		$ 26,147	$ 20,930	$ 17,287
Net proceeds after deducting offering expenses		$ (11,078)
Private Placement | Common Stock
Class of Stock [Line Items]
Purchase of common stock by institutional purchasers	4.2
Purchase price per share	$ 2.851
Net proceeds after deducting offering expenses	$ 11,100
At-the-market Sales Agreement | Cowen and Company LLC | Common Stock
Class of Stock [Line Items]
Number of shares sold under facility		1.2
Net proceeds from issuance of stock		$ 3,200