Condensed Consolidated Statements of Operations and Comprehensive Income (Unaudited) - USD ($) shares in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Revenue	$ 24,723,000	$ 21,264,000
Operating expenses:
Cost of product revenue	7,311,000	7,845,000
Research & development	4,258,000	5,161,000
Selling, general & administrative	7,672,000	16,090,000
Total operating expenses	19,241,000	29,096,000
Income (loss) from operations	5,482,000	(7,832,000)
Interest and other income, net	498,000	95,000
Income (loss) before income taxes	5,980,000	(7,737,000)
Provision for (benefit from) income taxes	1,473,000	(1,051,000)
Net income (loss)	$ 4,507,000	$ (6,686,000)
Basic net income (loss) per share:
Net income (loss) (in dollars per share)	$ 0.32	$ (0.46)
Basic weighted average common shares outstanding (in shares)	14,185	14,679
Diluted net income (loss) per share:
Net income (loss) (in dollars per share)	$ 0.31	$ (0.46)
Diluted weighted average common shares outstanding (in shares)	14,314	14,679
Net income (loss)	$ 4,507,000	$ (6,686,000)
Foreign currency translation adjustment	(315,000)	620,000
Comprehensive income (loss)	4,192,000	(6,066,000)
Product [Member]
Revenue	24,717,000	21,258,000
Service [Member]
Revenue	$ 6,000	$ 6,000