CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE INCOME (LOSS) - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Revenues:
Services	$ 91,865,000	$ 95,511,000	$ 46,407,000
Product and product-related	26,474,000	29,956,000	14,419,000
Total revenues	118,339,000	125,467,000	60,826,000
Cost of revenues:
Services	75,833,000	75,515,000	35,968,000
Product and product-related	14,104,000	14,179,000	6,949,000
Total cost of revenues	89,937,000	89,694,000	42,917,000
Gross profit	28,402,000	35,773,000	17,909,000
Operating expenses:
Marketing and sales	9,154,000	10,049,000	4,741,000
General and administrative	19,360,000	19,988,000	9,888,000
Amortization of intangible assets	3,161,000	2,313,000	506,000
Goodwill impairment	2,746,000	338,000	0
Total operating expenses	34,421,000	32,688,000	15,135,000
(Loss) income from operations	(6,019,000)	3,085,000	2,774,000
Other (expense) income:
Loss on extinguishment of debt	(709,000)	0	0
Total other expense	(2,088,000)	(1,200,000)	(257,000)
(Loss) income before income taxes	(8,107,000)	1,885,000	2,517,000
Income tax (expense) benefit	(27,623,000)	12,417,000	19,123,000
Net (loss) income	$ (35,730,000)	$ 14,302,000	$ 21,640,000
Net (loss) income per share:
Basic (usd per share)	$ (1.79)	$ 0.73	$ 1.13
Diluted (usd per share)	(1.79)	0.71	1.10
Dividends declared per common share (usd per share)	$ 0.21	$ 0.20	$ 0.20
Other comprehensive income (loss):
Unrealized gain (loss) on marketable securities	$ 17,000	$ (42,000)	$ (221,000)
Reclassification of other-than-temporary losses on available-for-sale securities included in net (loss) income	52,000	230,000	0
Total other comprehensive income (loss), before tax	69,000	188,000	(221,000)
Provision for income taxes	(22,000)	0	0
Total other comprehensive income (loss), after tax	47,000	188,000	(221,000)
Comprehensive (loss) income	$ (35,683,000)	$ 14,490,000	$ 21,419,000