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Shareholder Equity - Stock Options and Employee Stock Purchase Plan (Details) - USD ($)			3 Months Ended		6 Months Ended
	Mar. 14, 2019	Mar. 14, 2018	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Equity [Abstract]
Compensation expense related to vested awards			$ 2,000	$ 63,000	$ (16,000)	$ 274,000
Unrecognized compensation expense			0		0
2014 ESPP
Equity [Abstract]
Unrecognized compensation expense			$ 3,400,000		$ 3,400,000
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Issuance of common stock pursuant to the 2014 ESPP (in shares)	8,601	9,565	0
Purchase price of shares authorized (in USD per share)	$ 0.8356	$ 0.9800