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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2018
Mar. 31, 2019
Dec. 31, 2018
Mar. 31, 2018
Operating activities:            
Net loss $ (27,514) $ (51,450)        
Adjustments to reconcile net loss to net cash used in operating activities:            
Depreciation 3,106 4,563        
Non-cash operating lease expense 1,427          
Amortization expense of finance leases 574          
Amortization of intangible assets 8,105 8,544        
Stock-based compensation 6,953 1,881        
Deferred tax provision 441 906        
Change in fair value of financing derivatives (4,100) 2,180        
Change in fair value of investment in equity securities 1,712 449        
Accretion of debt discount 1,319 752        
Amortization of deferred financing costs 252 207        
Other (138) (69)        
Changes in operating assets and liabilities:            
Accounts receivable 12,506 11,095        
Prepaid expenses and other assets 1,818 (597)        
Accounts payable, accrued expenses, and other liabilities (2,544) (19,761)        
Contract liability and customer advances (2,500) (3,498)        
Operating lease liabilities (2,993)          
Net cash used in operating activities (1,576) (44,798)        
Investing activities:            
Proceeds from sale of investment in equity securities 705 0        
Purchases of property and equipment (1,836) (725)        
Capitalized internal-use software costs (3,109) (1,932)        
Net cash used in investing activities (4,240) (2,657)        
Financing activities:            
Proceeds from borrowings on senior secured convertible notes (related party) 0 85,000        
Debt issuance costs 0 (4,315)        
Financing proceeds received on subscription receivable (related party) 0 3,065        
Proceeds from exercise of stock options 1,191 0        
Payments for taxes related to net share settlement of equity awards (1,138) (4,099)        
Principal payments on finance leases (694)          
Principal payments on capital lease and software license arrangements (823) (2,859)        
Net cash (used in) provided by financing activities (1,464) 76,792        
Effect of exchange rate changes on cash, cash equivalents and restricted cash (75) 368        
Net (decrease) increase in cash, cash equivalents and restricted cash (7,355) 29,705        
Cash, cash equivalents and restricted cash at beginning of period 50,198 45,125 $ 45,125      
Cash, cash equivalents and restricted cash at end of period 42,843 74,830 50,198      
Cash and cash equivalents       $ 36,741 $ 44,096 $ 67,266
Restricted cash       6,102 6,102 7,564
Total cash, cash equivalents and restricted cash 50,198 45,125 $ 45,125 $ 42,843 $ 50,198 $ 74,830
Supplemental cash flow disclosures:            
Interest paid ($3,046 of 2019 and $- of 2018 interest paid attributable to related party) 3,181 265        
Income taxes (refunded) paid (348) 37        
Supplemental disclosures of non-cash activities:            
Change in accrued capital expenditures 1,170 250        
Settlement of restricted stock unit liability 4,610 0        
Repurchase of Common Stock in exchange for senior secured convertible notes 0 63,570        
Common Stock warrants issued with senior secured convertible notes 0 5,733        
Fair value of financing derivatives issued with senior secured convertible notes $ 0 $ 12,940