v3.6.0.2
CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
OPERATING ACTIVITIES:      
Net income $ 20,482 $ 15,929 $ 5
Adjustments to reconcile net income to net cash provided by (used in) operating activities:      
Depreciation and amortization 3,798 1,828 680
Stock based compensation 5,056 374 107
Change in fair value of preferred stock warrant liabilities 9,458 5,961 558
Deferred income taxes (607) 338 (1,509)
Other 3,050 718 289
Changes in operating assets and liabilities:      
Accounts receivable (187,736) (114,170) (53,315)
Prepaid expenses and other assets (2,675) (3,040) (527)
Accounts payable 209,483 50,021 35,706
Accrued expenses and other liabilities 14,722 5,481 3,161
Net cash provided by (used in) operating activities 75,031 (36,560) (14,845)
INVESTING ACTIVITIES:      
Purchase of property and equipment (6,884) (5,128) (832)
Capitalized software development costs (2,337) (1,799) (825)
Purchase of short-term investment     (551)
Redemption of short-term investment   551  
Net cash used in investing activities (9,221) (6,376) (2,208)
FINANCING ACTIVITIES:      
Proceeds from line of credit 75,847 30,000 1,000
Repayment on line of credit (65,000) (15,000) (4,000)
Proceeds from term debt   15,000 15,000
Repayment of term debt (30,000)   (3,500)
Payment of debt financing costs (976) (190) (178)
Payment of financing obligations (550) (109) (109)
Repurchase of preferred stock and common stock (54,000)   (561)
Proceeds from exercise of stock options 488 166 1
Proceeds from employee stock purchase plan 4,224    
Payment of stock repurchase costs (155) (39)  
Payment of Series C convertible preferred stock offering cost (129)    
Proceeds from the issuance of Class A common stock in IPO, net of underwriting commissions 78,120    
Payment of offering costs-IPO (4,326) (160)  
Net cash provided by financing activities 63,543 29,668 28,003
Increase (decrease) in cash 129,353 (13,268) 10,950
Cash-Beginning of year 4,047 17,315 6,365
Cash-End of year 133,400 4,047 17,315
SUPPLEMENTAL CASH FLOW INFORMATION:      
Cash paid for income taxes 16,740 12,931 150
Cash paid for interest 1,696 895 487
Capitalized assets financed by accounts payable 3,490 88 27
Asset retirement obligation 354    
Stock-based compensation included in capitalized development costs 88 11 4
Conversion of convertible preferred stock to Class B common stock 83,241    
Conversion of warrant for convertible preferred stock to a warrant for Class B common stock and net exercise of warrant to purchase Class B common stock 12,596    
Deferred IPO offering costs and stock repurchase costs included in accounts payable   $ 58  
Net exercise of warrants to purchase Series Seed convertible preferred stock 3,789    
Series B convertible preferred stock      
FINANCING ACTIVITIES:      
Proceeds from issuance of convertible preferred stock     $ 20,350
Series C convertible preferred stock      
FINANCING ACTIVITIES:      
Proceeds from issuance of convertible preferred stock $ 60,000