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Basis of Presentation and Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract] |
Fair Value Measurements, Valuation Techniques | The three levels of the hierarchy and the related inputs are as follows:
Level |  | Inputs |  |  |
1 |  | Unadjusted quoted prices in active markets for identical assets and liabilities.
2 |  | Unadjusted quoted prices in active markets for similar assets and liabilities;
|  | Unadjusted quoted prices for identical or similar assets or liabilities in markets that are not active; or
|  | Inputs other than quoted prices that are observable for the asset or liability.
3 |  | Unobservable inputs for the asset or liability.
Supplemental Schedule of Non-Cash Investing and Financing Activities | Consolidated Statements of Cash Flows - Supplemental Schedule of Non-Cash Investing and Financing Activities
| Year Ended December 31,
| 2018 |  | 2017 |  | 2016
| (in thousands)
Accrued purchases of property, equipment, and software | $ | 1,141 |  |  | $ | 2,195 |  |  | $ | 2,728 |
Series A preferred stock conversion | 100,000 |  |  | — |  |  | — |
Series A preferred stock accretion, net (1) | 17,567 |  |  | 3,532 |  |  | 3,244 |
Vendor financed insurance premiums | — |  |  | 1,450 |  |  | 2,082 |
(1) Represents total accretion of $17.6 million, net of $6.1 million acquired value of beneficial conversion feature attributable to repurchased Series A Preferred.

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- Definition Tabular disclosure of input and valuation technique used to measure fair value and change in valuation approach and technique for each separate class of asset and liability measured on recurring and nonrecurring basis. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb) -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258 + Details
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- Definition Tabular disclosure of supplemental cash flow information for the periods presented. + References No definition available. + Details
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