Condensed Consolidated Balance Sheets (Unaudited) (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Accounts receivable, allowance for doubtful accounts	$ 4,265	$ 3,783
Preferred stock, par value	$ 0.01	$ 0.01
Preferred stock, shares authorized	1,000,000	1,000,000
Preferred stock, shares issued	0	0
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	25,000,000	25,000,000
Common stock, shares issued	12,000,000	12,000,000
Total current assets	$ 93,529	$ 82,922
Total current liabilities	87,433	80,347
VIE [Member]
Total current assets	55,734	45,815
Total current liabilities	29,616	28,383
VIE [Member] | Asset Pledged as Collateral
Total current assets	55,700	45,800
Assets, Noncurrent	239,700	247,800
Total current liabilities	29,600	28,400
Liabilities, Noncurrent	$ 1,700	$ 2,600