Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Debt issuance costs, current	$ 260
Debt issuance costs, noncurrent	$ 1,506
Voting Common Stock [Member]
Common stock, par value	$ 0.10	$ 0.10
Common stock, shares authorized	12,500,000	12,500,000
Common stock, shares issued	2,905,757	2,905,757
Common stock, shares outstanding	2,905,757	2,905,757
Non-Voting Common Stock [Member]
Common stock, par value	$ 0.10	$ 0.10
Common stock, shares authorized	37,500,000	37,500,000
Common stock, shares issued	12,919,681	12,897,614
Common stock, shares outstanding	12,919,681	12,897,614
Related Party Term Loan [Member]
Debt issuance costs, noncurrent	$ 765