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Warrants to Acquire Shares of Common Stock - Changes in Fair Value of Warrant Liability (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2021 USD ($)
Class of Warrant or Right, Fair Value [Roll Forward]
Warrant liability, beginning balance	$ 55
Change in fair value of warrants	59
Warrant liability, ending balance	114
Other warrants (liability-classified)
Class of Warrant or Right, Fair Value [Roll Forward]
Warrant liability, beginning balance	55
Change in fair value of warrants	59
Warrant liability, ending balance	$ 114