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Subsequent Events - Additional Information (Details) - USD ($) $ / shares in Units, $ in Millions	Jul. 11, 2019	Jun. 30, 2019	Jun. 06, 2019	Dec. 31, 2018
Subsequent Event [Line Items]
Debt instrument, principal face amount		$ 10.5	$ 2.0	$ 4.5
Interest rate on promissory note			8.00%
Preferred stock, par value (in dollars per share)		$ 0.01		$ 0.01
Warrant exercise price		$ 0.23		$ 0.22
Roth Capital Partners, LLC [Member] | Subsequent Event [Member]
Subsequent Event [Line Items]
Payments to private placement agent	$ 0.6
Series E Preferred Stock [Member] | Private Placement [Member] | Subsequent Event [Member]
Subsequent Event [Line Items]
Proceeds from private placement, gross	20.0
Series E Preferred Stock [Member] | Private Placement [Member] | Roth Capital Partners, LLC [Member] | Subsequent Event [Member]
Subsequent Event [Line Items]
Payments to private placement agent	$ 1.4
Series E Preferred Stock [Member] | Private Placement [Member] | Securities Purchase Agreement [Member] | Subsequent Event [Member]
Subsequent Event [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
Series D Warrants [Member]
Subsequent Event [Line Items]
Number of common shares issuable on cancellation of warrants			3,900,000
Pre-Funded Series D Warrants [Member]
Subsequent Event [Line Items]
Number of common shares issuable on cancellation of warrants			53,400,000
2019 Warrants [Member] | Subsequent Event [Member]
Subsequent Event [Line Items]
Warrant exercise price	$ 0.06
Warrant exercisable term	5 years

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Exercise price per share or per unit of warrants or rights outstanding.

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-SubTopic 10
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Number of securities into which the class of warrant or right may be converted. For example, but not limited to, 500,000 warrants may be converted into 1,000,000 shares.

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Face (par) amount of debt instrument at time of issuance.

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Contractual interest rate for funds borrowed, under the debt agreement.

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Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event.

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