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Debt (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2018 | Mar. 31, 2017 | Dec. 31, 2017
Carrying value of convertible notes [Abstract] |  |  |
Discount | $ 696 | $ 0 |
Carrying value | $ 39,084 |  | $ 0
2021 Convertible Notes [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Debt instrument maturity date | Aug. 01, 2021 |  |
Convertible senior notes, interest rate, stated percentage | 5.75% |  |
Debt conversion ratio | 31.1876 |  |
Conversion price (in dollars per share) | $ 1 |  |
Percentage of common stock conversion price | 200.00% |  |
Number of trading days immediately preceding notice of redemption | 5 days |  |
Redemption price percentage | 100.00% |  |
Percentage of convertible notes due and payable in event of default | 100.00% |  |
Debt instrument, additional interest in the event of default for first 90 Days | 0.25% |  |
Debt instrument, additional interest in the event of default between 91st Day to 180th Day | 0.50% |  |
Effective interest rate | 15.30% |  |
Fair value convertible note | $ 38,388 |  |
Carrying value of convertible notes [Abstract] |  |  |
Principal amount | 52,000 |  |
Discount | (12,916) |  |
Carrying value | $ 39,084 |  |
2021 Convertible Notes [Member] | Minimum [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Debt conversion ratio | 0 |  |
Stock price considered for conversion rate (in dollars per share) | $ 26.72 |  |
Percentage holders of principal amount of debt | 25.00% |  |
2021 Convertible Notes [Member] | Maximum [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Debt conversion ratio | 6.2375 |  |
Stock price considered for conversion rate (in dollars per share) | $ 160.00 |  |

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- Definition Amount of noncash expense included in interest expense to amortize debt discount and premium associated with the related debt instruments. Excludes amortization of financing costs. Alternate captions include noncash interest expense. + References Reference 1: 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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28541-108399 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.8) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
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- Definition Carrying value as of the balance sheet date of long-term debt (with maturities initially due after one year or beyond the operating cycle if longer) identified as Convertible Notes Payable, excluding current portion. Convertible Notes Payable is a written promise to pay a note which can be exchanged for a specified amount of another, related security, at the option of the issuer and the holder. + 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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