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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
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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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- Definition Exercise price per share or per unit of warrants or rights outstanding. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(i)(4)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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- Definition 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(i)(2)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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- Definition Face (par) amount of debt instrument at time of issuance. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28551-108399 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=114775985&loc=d3e28878-108400 + Details
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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition 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. + References No definition available. + Details
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