Schedule II - Valuation and Qualifying Accounts - Valuation and Qualifying Accounts and Reserves (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Doubtful Receivables [Member]
Balance at beginning of period		$ 96
Charged (credited) to costs & expenses
Doubtful receivables		96	[1]
Balance at end of period
Discount Returns and Allowance [Member]
Balance at beginning of period		107
Charged (credited) to costs & expenses
Doubtful receivables		107	[1]
Balance at end of period
Doubtful Receivables & Discounts Returns and Allowances [Member]
Balance at beginning of period		203
Charged (credited) to costs & expenses
Doubtful receivables		203
Balance at end of period

[1] Uncollectible receivables and reserves for discounts, returns, and allowances were disposed of in the Asset Sale on March 2, 2018