Quarterly Financial Information (Unaudited) (Tables)

12 Months Ended

Dec. 31, 2017

Quarterly Financial Information Disclosure [Abstract]

Summary of Condensed Consolidated Statements of Operations

	Condensed Consolidated Statements of Operations
	2017
	Q1		Q2			Q3			Q4
			(in thousands, except per share data)
Revenue	$	22,841	$	18,848		$	19,653		$	19,469
Gross profit	$	6,253	$	3,873		$	4,380		$	3,616
Income (loss) from operations	$	41	$	(2,619	)	$	(2,546	)	$	(4,297	)
Net income (loss)	$	202	$	(2,560	)	$	(2,468	)	$	(4,232	)
Basic income (loss) per share	$	0.02	$	(0.20	)	$	(0.20	)	$	(0.33	)
Diluted income (loss) per share	$	0.02	$	(0.20	)	$	(0.20	)	$	(0.33	)
Shares used in per share calculations:
Basic		12,550		12,577			12,607			12,640
Diluted		12,848		12,577			12,607			12,640

	2016
	Q1		Q2			Q3			Q4
			(in thousands, except per share data)
Revenue	$	25,439	$	22,738		$	22,467		$	26,797
Gross profit	$	4,296	$	3,893		$	3,677		$	3,954
Income (loss) from operations	$	649	$	(85	)	$	(415	)	$	(1,307	)
Net income (loss)	$	500	$	(185	)	$	(106	)	$	(1,261	)
Basic income (loss) per share	$	0.04	$	(0.02	)	$	(0.01	)	$	(0.10	)
Diluted income (loss) per share	$	0.04	$	(0.02	)	$	(0.01	)	$	(0.10	)
Shares used in per share calculations:
Basic		12,102		12,152			12,310			12,473
Diluted		12,531		12,152			12,310			12,473

Summary of Condensed Consolidated Balance Sheets

	Condensed Consolidated Balance Sheets
	2017
	March 31		June 30		September 30		December 31
	(in thousands)
Cash, cash equivalents and short-term investments	$	30,984	$	27,296	$	26,758	$	24,754
Total current assets	$	49,092	$	47,077	$	45,021	$	44,253
Total assets	$	54,403	$	52,395	$	50,247	$	49,434
Total current liabilities	$	14,310	$	14,445	$	14,351	$	17,427
Total shareholders' equity	$	39,206	$	37,099	$	35,238	$	31,430

	2016
	March 31		June 30		September 30		December 31
	(in thousands)
Cash, cash equivalents and short-term investments	$	27,626	$	26,898	$	31,577	$	33,200
Total current assets	$	49,683	$	47,059	$	51,844	$	55,657
Total assets	$	55,389	$	52,680	$	57,355	$	61,008
Total current liabilities	$	16,322	$	13,407	$	15,502	$	20,221
Total shareholders' equity	$	37,873	$	38,166	$	38,790	$	38,112