Quarterly report pursuant to Section 13 or 15(d)

Condensed Consolidated Statements of Cash Flows

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Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2019
Dec. 31, 2018
Cash flows from operating activities:        
Net loss $ (12,684) $ (16,306)    
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:        
Depreciation and amortization 1,604 1,133    
Change in fair value of warrant liability (2) 13    
Provision for doubtful accounts   25    
Stock-based compensation expense 4,456 5,507    
Other   (19)    
Changes in assets and liabilities:        
Accounts receivable (555) 2,716    
Expenditures billable to clients 5,446 (4,331)    
Prepaid expenses and other current assets 406 637    
Accounts payable (763) (7,999)    
Accrued media payments 3,334 5,927    
Client advances 947 6,582    
Other accrued liabilities (644) 1,593    
Other liabilities (42) (110)    
Net cash provided by (used in) operating activities 1,503 (4,632) $ (30,117) $ (41,770)
Cash flows from investing activities:        
Proceeds from sales of marketable securities   2,473    
Capital expenditures (9) (98)    
Net cash (used in) provided by investing activities (9) 2,375    
Cash flows from financing activities:        
Proceeds from common stock offerings, net 3,505 4,160    
Proceeds from issuances of stock under employee stock plans, net 101 324    
Net cash provided by financing activities 3,606 4,484    
Net increase in cash, cash equivalents and restricted cash 5,100 2,227    
Cash, cash equivalents and restricted cash, beginning of period 44,920 38,776 38,776  
Cash, cash equivalents and restricted cash, end of period $ 50,020 $ 41,003 $ 44,920 $ 38,776