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Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Cash flows from operating activities:    
Net loss $ (16,396) $ (16,150)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation, amortization and write-off of property and equipment 747 764
Amortization and write-off of intangibles 372 287
Stock-based compensation 4,053 3,480
Changes in operating assets and liabilities:    
Trade accounts receivable (351) 2,561
Other current assets (40) 210
Other assets 77 (35)
Accounts payable and other accrued liabilities 1,132 (227)
Deferred revenue (244) (658)
Lease liability and other long-term liabilities (325) (21)
Net cash used in operating activities (10,975) (9,789)
Cash flows from investing activities:    
Purchase of property and equipment (404) (557)
Capitalized patent costs (359) (402)
Maturity of marketable securities 14,671 20,839
Purchase of marketable securities (15,085) (15,637)
Net cash provided by (used in) investing activities (1,177) 4,243
Cash flows from financing activities:    
Issuance of common stock, net of issuance costs 19,615 0
Exercise of stock options 293 914
Purchase of common stock (1,868) (1,120)
Net cash provided by (used in) financing activities 18,040 (206)
Net increase (decrease) in cash and cash equivalents 5,888 (5,752)
Cash and cash equivalents at beginning of period 27,278 40,823
Cash and cash equivalents at end of period 33,166 35,071
Supplemental disclosure of cash flow information:    
Cash received for income taxes, net 93 98
Supplemental schedule of non-cash activities:    
Property and equipment and patent costs in accounts payable (7) 8
Stock-based compensation capitalized to software and patent costs 90 93
Right of use assets obtained in exchange for lease obligations $ 2,709 $ 0