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Stockholders' Equity - Warrant Exchange - Additional Information (Details) - USD ($)	1 Months Ended	3 Months Ended		6 Months Ended
	Apr. 30, 2019	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Stockholders Equity Note [Line Items]
Loss in exchange of common stock for warrants		$ 6,000	$ 2,826,000	$ 6,000	$ 2,826,000
Exchange Agreement [Member]
Stockholders Equity Note [Line Items]
Shares of common stock issued for exchange warrants	64,000
Loss in exchange of common stock for warrants	$ 6,000

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Amount of amortization expense attributable to debt issuance costs.

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