Condensed Consolidated Statements of Cash Flows - Unaudited - USD ($) $ in Thousands	6 Months Ended
Jun. 30, 2020	Jun. 30, 2019
Operating activities:
Cash provided by (used in) operating activities	$ (352)	$ 4,195
Net cash provided by (used in) operating activities	(352)	4,195
Investing activities:
Purchases of property, plant and equipment	(66)	(12)
Proceeds from sale of property, plant and equipment	24	0
Net cash used in investing activities	(42)	(12)
Financing activities:
Payment of withholding taxes on exercise of restricted stock units	0	(5)
Purchases of treasury stock	(6,491)	(7,044)
Net cash used in financing activities	(6,491)	(7,049)
Increase (decrease) in cash and cash equivalents	(6,885)	(2,866)
Cash and cash equivalents, beginning of the period	18,169	12,550
Cash and cash equivalents, end of the period	$ 11,284	$ 9,684

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