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Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Operating activities:    
Net loss $ (687) $ (5,823)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:    
Stock-based compensation 6,547 4,259
Revaluation of common stock warrant liability to estimated fair value (27) 405
Depreciation and amortization 1,950 1,619
Amortization of right-of-use assets 677 612
Revaluation of contingent consideration to estimated fair value (44) 190
Changes in operating assets and liabilities:    
Accounts receivable (8,755) 2,346
Inventory (4,056) (1,343)
Prepaid and other assets (3,628) (545)
Operating leases liabilities, net (320) (344)
Accounts payable 1,496 1,757
Accrued compensation (7,662) (5,914)
Accrued and other liabilities 1,661 48
Refund liability - CMS advance payment (20,496) 0
Change in deferred taxes (286) (322)
Net cash used in operating activities (33,630) (3,055)
Investing activities:    
Acquisition of business, net of cash acquired (3,543) 0
Acquisition of intangible assets (1,200) 0
Maturities of marketable securities 25,072 0
Additions of capital expenditures, net (1,250) (1,704)
Net cash provided by (used in) investing activities 19,079 (1,704)
Financing activities:    
Proceeds from issuance of common stock under employee stock purchase plan 667 358
Taxes paid related to net share settlement of restricted stock units (2,313) (1,507)
Proceeds from exercise of warrants 0 304
Proceeds from exercise of stock options 2,193 155
Principal payments on finance lease obligations (34) (45)
Net cash provided by (used in) financing activities 189,228 (735)
Effect of exchange rate changes on cash and cash equivalents (23) (552)
Net increase (decrease) in cash, cash equivalents and restricted cash 174,654 (6,046)
Cash, cash equivalents, and restricted cash at beginning of period 134,939 38,479
Cash, cash equivalents, and restricted cash at end of period 309,593 32,433
Public Offering    
Financing activities:    
Proceeds from issuance of common shares in public equity offering, net of issuance costs paid $ 188,715 $ 0