CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
Operating Activities:
Net income (loss)	$ 2,096	$ (370)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation	151	318
Amortization of premiums and discounts on investments	75	18
Stock-based compensation	142	484
Changes in assets and liabilities:
Accounts receivable, net	721	(349)
Prepaid expenses and other current assets	404	61
Other long-term assets	52	208
Accounts payable	88	(25)
Accrued compensation	(315)	357
Accrued legal settlement	(10,000)	0
Other accrued liabilities	79	(200)
Other long-term liabilities	7	(147)
Deferred revenue	75	(569)
Net cash used in operating activities	(6,425)	(214)
Investing Activities:
Purchases of property and equipment	(38)	(191)
Purchases of investments	(13,077)	(13,510)
Maturities of investments	15,767	14,654
Net cash provided by investing activities	2,652	953
Financing activities:
Proceeds from employee stock purchase plan	27	38
Proceeds from exercise of stock	0	98
Net cash provided by financing activities	27	136
Effect of exchange rate changes on cash and cash equivalents	28	(221)
Net (decrease) increase in cash and cash equivalents	(3,718)	654
Cash and cash equivalents at beginning of period	25,182	18,050
Cash and cash equivalents at end of period	21,464	18,704
Supplemental schedule of cash flow information:
Income taxes paid	$ 72	$ 62