Condensed Consolidated Statements of Cash Flows - Unaudited - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
Operating activities:
Cash provided by (used in) operating activities - continuing operations	$ 3,084	$ (8,672)
Cash used in operating activities - discontinued operations	(5,396)	(8,714)
Net cash used in operating activities	(2,312)	(17,386)
Investing activities:
Purchases of investments	(552)	(758)
Proceeds from sale of investments	7,330	405
Purchases of property, plant and equipment	(5)	(71)
Proceeds from sale of property, plant and equipment	378	661
Cash provided by investing activities - continuing operations	7,151	237
Cash provided by (used in) investing activities - discontinued operations	5,890	(712)
Net cash provided by (used in) investing activities	13,041	(475)
Financing activities:
Payment of withholding taxes on exercise of restricted stock units	(556)
Purchases of treasury stock	(690)
Cash used in financing activities - continuing operations	(1,246)	0
Cash provided by (used in) financing activities - discontinued operations	(3,232)	5,998
Net cash provided by (used in) financing activities	(4,478)	5,998
Increase (decrease) in cash and cash equivalents	6,251	(11,863)
Cash and cash equivalents, beginning of the period	60,980	57,400
Cash and cash equivalents, end of the period	67,231	45,537
Less cash and cash equivalents of discontinued operations at the end of the period	30,510	33,279
Cash and cash equivalents of continuing operations, end of the period	36,721	12,258
Unpaid liability incurred for development costs		395
Issuance of common stock for vested restricted stock units	$ 2,571	$ 189