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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
OPERATING ACTIVITIES:    
Net income (loss) $ 4,909 $ (1,040)
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:    
Depreciation and amortization 1,493 819
Stock-based compensation 2,322 159
Change in fair value of preferred stock warrant liabilities   4,383
Bad debt expense 3,347 86
Other (274) 151
Changes in operating assets and liabilities:    
Accounts receivable 59,190 22,981
Prepaid expenses and other assets (5,017) (3,717)
Accounts payable (87,940) (6,505)
Accrued expenses and other liabilities (770) (432)
Net cash provided by (used in) operating activities (22,740) 16,885
INVESTING ACTIVITIES:    
Purchases of property and equipment (3,602) (384)
Capitalized software development costs (647) (545)
Net cash used in investing activities (4,249) (929)
FINANCING ACTIVITIES:    
Proceeds from line of credit   55,847
Repayment on line of credit   (20,000)
Repayment of term debt   (30,000)
Payment of debt financing costs   (775)
Payment of financing obligations (113) (29)
Proceeds from issuance of Series C convertible preferred stock   60,000
Repurchase of preferred stock and common stock   (54,000)
Proceeds from exercise of stock options 275 61
Payment of stock repurchase costs   (70)
Payment of Series C convertible preferred stock offering costs   (73)
Payment of offering costs-initial public offering   (105)
Net cash provided by financing activities 162 10,856
Increase (decrease) in cash (26,827) 26,812
Cash-Beginning of period 133,400 4,047
Cash-End of period 106,573 30,859
SUPPLEMENTAL CASH FLOW INFORMATION:    
Capitalized assets financed by accounts payable 1,687 49
Tenant improvements paid by lessor 640  
Stock-based compensation included in capitalized development costs $ 45 1
Debt financing costs included in accounts payable   201
Stock repurchase costs and Series C convertible preferred stock offering costs included in accounts payable   141
Deferred initial public offering costs included in accounts payable   431
Net exercise of warrants to purchase Series Seed convertible preferred stock   $ 3,789