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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Operating Activities      
Net income $ 42,146 $ 65,170 $ 13,199
Adjustments to reconcile net income to net cash provided by operating activities:      
Depreciation and amortization 7,817 5,029 3,795
Currency (gain) loss on foreign denominated transactions (690) (190) 128
Deferred taxes (3,734) (39,040) (1,117)
Provision for doubtful accounts 1,091 1,680 1,117
Stock–based compensation expense 34,301 20,794 5,028
Amortization of deferred contract costs 8,416 3,689  
Changes in operating assets and liabilities:      
Accounts receivable, net (9,608) (1,911) (7,039)
Prepaid expenses, prepaid income taxes, and other assets (378) (11,753) (2,287)
Deferred contracts costs (15,979) (12,987)  
Accounts payable 4,268 9,345 6,244
Accrued expenses, accrued income taxes and other current liabilities 2,151 2,695 5,191
Deferred revenue 1,174 4,508 962
Deferred rent   4,289 227
Lease obligations (1,468)    
Other non–current liabilities 609 405 243
Net cash provided by operating activities 70,116 51,723 25,691
Investing Activities      
Purchases of property and equipment (11,205) (5,956) (5,157)
Capitalization of website development costs (3,021) (1,522) (2,215)
Cash paid for acquisition (19,139)    
Investments in certificates of deposit (177,808) (212,800) (50,000)
Maturities of certificates of deposit 188,916 140,000 44,774
Net cash used in investing activities (22,257) (80,278) (12,598)
Financing Activities      
Initial public offering proceeds     47,690
Payment of initial public offering costs   (1,142) (3,308)
Proceeds from exercise of stock options 1,807 3,632 398
Financing cash flows from finance leases (30)    
Payment of withholding taxes and option costs on net share settlement of restricted stock units and stock options (16,470) (25,885)  
Net cash (used in) provided by financing activities (14,693) (23,395) 44,780
Impact of foreign currency on cash, cash equivalents, and restricted cash (1) (44) 159
Net increase (decrease) in cash, cash equivalents, and restricted cash 33,165 (51,994) 58,032
Cash, cash equivalents, and restricted cash at beginning of period 37,558 89,552 31,520
Cash, cash equivalents, and restricted cash at end of period 70,723 37,558 89,552
Supplemental disclosure of cash flow information:      
Cash paid for income taxes 300 2,308 4,393
Unpaid purchases of property and equipment 647 5,287 510
Unpaid initial public offering costs     1,142
Capitalized stock-based compensation expense in website development and internal-use software costs 1,381 $ 490 $ 176
Cash paid for operating lease liabilities $ 10,906