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Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Cash flows from operating activities:    
Net loss $ (11,951) $ (2,315)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:    
Stock-based compensation 4,065 3,354
Depreciation and amortization 1,893 1,800
Amortization of acquired intangible assets 748 756
Reversal of uncertain tax positions (10) (31)
Accretion on short-term marketable securities (10) (52)
Deferred income tax benefit 4 0
Gain on sale of marketable securities (4) 0
Gain on sale of patents 0 (3,905)
Inventory step-up and backlog amortization 0 12
Changes in operating assets and liabilities, net of acquisition:    
Accounts receivable, net 4,990 (371)
Inventories 634 100
Prepaid expenses and other current and long-term assets, net 1,343 207
Accounts payable 191 37
Accrued current and long-term liabilities (1,804) (2,230)
Income taxes payable 77 382
Net cash provided by (used in) operating activities 166 (2,256)
Cash flows from investing activities:    
Proceeds from sales and maturities of short-term marketable securities 7,498 5,600
Purchases of short-term marketable securities (1,500) (6,045)
Purchases of property and equipment (612) (1,859)
Proceeds from sale of patents 0 4,250
Purchases of licensed technology 0 (521)
Payment associated with sale of patents 0 (345)
Net cash provided by investing activities 5,386 1,080
Cash flows from financing activities:    
Proceeds from line of credit 4,329 0
Net proceeds from "at the market" equity offering 2,474  
Proceeds from Paycheck Protection Program loan 796  
Proceeds from issuance of common stock under employee equity incentive plans 337 315
Payments on asset financings (328) (337)
Net cash provided by (used in) financing activities 7,608 (22)
Net increase (decrease) in cash and cash equivalents 13,160 (1,198)
Cash and cash equivalents, beginning of period 7,257 17,944
Cash and cash equivalents, end of period 20,417 16,746
Supplemental disclosure of cash flow information:    
Cash paid for income taxes, net of refunds received 211 291
Cash paid during the period for interest 107 66
Non-cash investing and financing activities:    
Acquisitions of property and equipment and other assets under extended payment terms $ 1,392 $ 0