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Basis of Presentation and Summary of Significant Accounting Policies (Tables)
 12 Months Ended
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.