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Fair Value Measurements - Narrative (Details) - USD ($) | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2018 | Mar. 31, 2017 | Mar. 31, 2016 | Sep. 28, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Secured debenture issuance costs and discount | $ 1,827,000 |  |  |  | $ 6,315,000 |  |  |  | $ 1,827,000 | $ 6,315,000 |  |
Convertible notes, net of debt issuance costs and discounts of $1,827 and $6,315, respectively | $ 3,873,000 |  |  |  | $ 9,685,000 |  |  |  | $ 3,873,000 | $ 9,685,000 |  |
Stock price (in dollars per share) | $ 2.01 |  |  |  | $ 0.94 |  |  |  | $ 2.01 | $ 0.94 |  | $ 0.99
Change in fair value of convertible note embedded derivative liability |  |  |  |  |  |  |  |  | $ (7,559,000) | $ 475,000 | $ 0 |
Fair Value Adjustment of Warrants | $ 682,000 | $ 898,000 | $ 1,164,000 | $ 464,000 | $ 650,000 | $ (937,000) | $ 140,000 | $ 0 | 3,208,000 | (147,000) | $ 0 |
Convertible Notes Payable |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Original discount |  |  |  |  |  |  |  |  |  |  |  | $ 4,916,000
Debt face amount | 5,700,000 |  |  |  | $ 16,000,000 |  |  |  | 5,700,000 | $ 16,000,000 |  | $ 16,000,000
Interest rate |  |  |  |  |  |  |  |  |  |  |  | 8.75%
Issuance of common stock related to debt |  |  |  |  |  |  |  |  | 10,300,000 |  |  |
Secured debenture issuance costs and discount | 1,827,000 |  |  |  |  |  |  |  | 1,827,000 |  |  |
Convertible notes, net of debt issuance costs and discounts of $1,827 and $6,315, respectively | $ 3,873,000 |  |  |  |  |  |  |  | $ 3,873,000 |  |  |

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- Definition The value of the financial instrument(s) that the original debt is being converted into in a noncash (or part noncash) transaction. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4304-108586 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4332-108586 + Details
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- Definition Face (par) amount of debt instrument at time of issuance. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=64930739&loc=d3e28878-108400 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28551-108399 + Details
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- Definition Amount of expense (income) related to adjustment to fair value of warrant liability. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 480 -SubTopic 10 -Section 25 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=6939902&loc=d3e20148-110875 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 + Details
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- Definition Aggregate net gain (loss) on all derivative instruments recognized in earnings during the period, before tax effects. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5618551-113959 + Details
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- Definition Amount after unamortized (discount) premium and debt issuance costs of long-term debt classified as noncurrent and excluding amounts to be repaid within one year or the normal operating cycle, if longer. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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