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Stockholders' Equity - Preferred Stock Issuances - Additional Information (Details) - USD ($) $ / shares in Units, $ in Thousands			3 Months Ended	6 Months Ended
	May 05, 2020	Jul. 11, 2019	Jun. 30, 2020	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019	Aug. 19, 2019	Jun. 06, 2019
Stockholders Equity Note [Line Items]
Preferred stock, par value (in dollars per share)			$ 0.01	$ 0.01		$ 0.01
Shares issued, par value per share			0.01	$ 0.01		$ 0.01
Conversion price	$ 10.00
Offering price				$ 19,378	$ 0
Warrant exercise price			$ 10.00	$ 10.00
Deemed dividend for triggering of warrant down round feature			$ (55)	$ (55)
Preferred stock, shares outstanding (in shares)			25,950	25,950		41,517
Number of warrants outstanding (in shares)			4,422,499	4,422,499		1,826,608
2019 Warrants [Member]
Stockholders Equity Note [Line Items]
Offering price	$ 22,000
Warrant exercise price	$ 10.00					$ 23.04
Deemed dividend for triggering of warrant down round feature	$ 55
Number of warrants outstanding (in shares)			1,800,000	1,800,000
Series E Convertible Preferred Stock [Member] | July 2019 Private Placement [Member] | Securities Purchase Agreement [Member]
Stockholders Equity Note [Line Items]
Number of shares issued		20,000
Preferred stock, par value (in dollars per share)		$ 0.01
Shares issued, price per share		1,000
Shares issued, par value per share		$ 0.01
Series E Preferred Stock and Related Warrants [Member]
Stockholders Equity Note [Line Items]
Conversion price								$ 1,500
Series E Preferred Stock and Related Warrants [Member] | July 2019 Private Placement [Member]
Stockholders Equity Note [Line Items]
Debt and warrants exchanged for preferred stock		$ 11,800
Number of preferred stock and warrants issued upon conversion		11,500
Value of accounts payable exchanged		$ 100
Number of shares issued upon exchange of accounts payable		149
Number of shares issued upon exchange of investor waiver rights		923
Series E-1 Convertible Preferred Stock [Member] | August 2019 Private Placement [Member] | Securities Purchase Agreement [Member]
Stockholders Equity Note [Line Items]
Number of shares issued							9,510
Preferred stock, par value (in dollars per share)							$ 0.01
Shares issued, price per share							1,000
Shares issued, par value per share							$ 0.01
Preferred Stock [Member]
Stockholders Equity Note [Line Items]
Conversion price	$ 10.00					$ 23.04
Offering price	$ 22,000
Excess of the fair value of the common stock	$ 12,000

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