XML 16 R6.htm IDEA: XBRL DOCUMENT v3.19.1
Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Cash flows from operating activities    
Net loss $ (8,019) $ (11,117)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation and amortization 621 548
Stock-based compensation 4,415 3,247
Amortization of debt discount and issuance costs 26 64
Accretion of discounts on investments, net (227) (171)
Provision for doubtful accounts and contractual allowances 4,709 2,680
Amortization of operating lease right-of-use assets 1,183  
Changes in operating assets and liabilities:    
Accounts receivable (10,984) (5,536)
Inventory (442) (174)
Prepaid expenses and other current assets (169) 790
Other assets (365) 409
Accounts payable (333) (950)
Accrued liabilities (6,380) (2,977)
Deferred rent   66
Deferred revenue 66 (139)
Operating lease liabilities (1,200)  
Net cash used in operating activities (17,099) (13,260)
Cash flows from investing activities    
Purchases of property and equipment (1,635) (1,108)
Purchases of available-for-sale investments (9,616) (5,437)
Maturities of available-for-sale investments 37,700 28,004
Net cash provided by investing activities 26,449 21,459
Cash flows from financing activities    
Proceeds from issuance of common stock, net 2,120 877
Tax withholding upon vesting of restricted stock awards (3,258) (1,274)
Net cash used in financing activities (1,138) (397)
Net increase in cash, cash equivalents, and restricted cash 8,212 7,802
Cash, cash equivalents and restricted cash beginning of period 20,023 8,671
Cash, cash equivalents and restricted cash end of period 28,235 16,473
Supplemental disclosures of cash flow information    
Interest paid 411 787
Non-cash investing and financing activities    
Property, plant and equipment costs included in accounts payable and accrued liabilities $ 38 $ 80