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Consolidated Statements of Cash Flows
$ in Thousands
 12 Months Ended
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Operating activities:      
Net (loss) income $ (39,756) $ (13,707) $ 781
Adjustments to reconcile net (loss) income to net cash used in operating activities:      
Depreciation and amortization 2,920 796 512
Amortization of inventory fair market value adjustment 4,175 0 0
Gain on disposal of property and equipment 0 (2) 0
Stock-based compensation 1,998 1,341 535
Amortization of deferred revenue (45) (130) (727)
Amortization of debt discount and noncash interest expense (101) 247 799
Revaluation of contingent consideration to estimated fair value (456) (126) (1,239)
Revaluation of warrants and derivative liabilities to estimated fair value 250 0 (225)
Non-cash goodwill impairment 13,021 0 0
Non-cash income tax benefit in connection with business acquisition 0 0 (1,500)
Changes in operating assets and liabilities:      
Accounts receivable 1,047 320 (417)
Inventory 492 (80) (168)
Prepaid and other assets 999 (823) (310)
Accounts payable (620) 489 510
Accrued payroll liabilities 977 682 298
Accrued royalties 21 1 (2,563)
Accrued and other liabilities (105) 1,240 364
Change in deferred taxes (1,340) 0 0
Net cash used in operating activities (16,523) (9,752) (3,350)
Investing activities:      
Purchase of property and equipment (549) (1,199) (733)
Payment for acquisitions, net of cash acquired (20,568) 0 (600)
Net cash used in investing activities (21,117) (1,199) (1,333)
Financing activities:      
Proceeds from initial public offering, net of underwriters’ discount 0 0 39,246
Payments of initial public offering costs 0 0 (3,733)
Proceeds from subordinated convertible debt, net of issuance costs 0 0 4,982
Proceeds from issuance of common stock, net of issuance costs 7,926 0 0
Proceeds from debt, net of issuance costs 0 15,625 0
Proceeds from private placement and subsequent financing, net of issuance costs 20,622 0 0
Proceeds from exercise of stock options 19 46 19
Proceeds from issuances of common stock under equity incentive plans 304 203 0
Principal payments on debt and capital lease obligations (3,944) (11,466) (4,528)
Net cash provided by (used in) financing activities 24,927 4,408 35,986
Effect of exchange rate changes on cash and cash equivalents 83 0 0
Net (decrease) increase in cash and cash equivalents (12,630) (6,543) 31,303
Cash and cash equivalents at beginning of period 29,888 36,431 5,128
Cash and cash equivalents at end of period 17,258 29,888 36,431
Supplemental disclosures of cash information      
Cash paid for interest 867 1,364 1,207
Supplemental disclosures of noncash investing and financing activities      
Property and equipment purchased under capital leases 0 25 193
Common stock issued for acquisition 7,205 0 14,242
Debt assumed as part of acquisition 13,421 0 0
Deferred purchase consideration 5,700 0 0
Conversion of convertible private placement and subsequent financing preferred stock to common stock 13,064 0 0
Conversion of convertible preferred stock to common stock upon initial public offering 0 0 149,444
Conversion of convertible preferred stock warrants to common stock warrants upon initial public offering 0 0 539
Conversion of convertible preferred stock to common stock upon initial public offering 0 0 5,108
Issuance of common stock for Board of Director services 304 223 34
Common stock warrants issued upon debt financing $ 0 $ 90 $ 0