Income Taxes (Details) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Loss before income taxes
Domestic	$ (14,097,000)	$ (20,577,000)	$ (32,238,000)
Foreign	(1,355,000)	(4,628,000)	(4,866,000)
Loss before income tax	(15,452,000)	(25,205,000)	(37,104,000)
Income tax benefit
Current federal benefit	285,000	55,000	40,000
Current state (expense) benefit	(69,000)	(14,000)	3,545,000
Current foreign benefit			2,492,000
Deferred federal expense	(251,000)	(274,000)	(51,000)
Deferred state benefit	127,000	344,000	697,000
Deferred foreign benefit (expense)	147,000	687,000	(1,409,000)
Total income tax benefit	$ 239,000	$ 798,000	$ 5,314,000
Reconciliation of income tax provision
Federal income tax rate (as a percent)	21.00%	21.00%	35.00%
Tax benefit computed at statutory rate of 21% and 35%	$ 3,245,000	$ 5,293,000	$ 12,986,000
Change in valuation allowance	(5,744,000)	(5,811,000)	(4,747,000)
State income tax benefit, net of federal tax	46,000	260,000	2,757,000
Foreign loss	2,827,000	1,319,000	1,593,000
Tax reform impact to deferred tax balances			(7,590,000)
Other	(135,000)	(263,000)	315,000
Total income tax benefit	239,000	798,000	$ 5,314,000
Deferred tax assets:
Federal tax net operating loss ("NOL") carryforward	25,921,000	24,848,000
Foreign tax NOL carryforward	6,418,000	5,298,000
State tax NOL carryforward	1,692,000	2,134,000
Other comprehensive income	379,000	490,000
Deferred revenue	351,000	697,000
Restricted stock and restricted stock unit awards	316,000	320,000
Foreign deferred taxes	242,000	466,000
Right-of-use assets	193,000
Canadian start-up costs	122,000	137,000
Self-insurance	106,000	111,000
Workers' compensation	96,000	60,000
Alternative Minimum Tax ("AMT") credit carryforward	79,000	315,000
Other	90,000	92,000
Gross deferred tax assets	36,005,000	34,968,000
Less valuation allowances	(28,299,000)	(22,806,000)
Net deferred tax assets	7,706,000	12,162,000
Deferred tax liabilities:
Property and equipment	(7,649,000)	(12,003,000)
Net deferred tax assets (liabilities)	$ 57,000	159,000
AMT credit refundable term (in years)	3 years
Canada
Deferred tax liabilities:
Net operating loss carry forwards	$ 24,683,000
Federal
Deferred tax liabilities:
Net deferred tax assets (liabilities)	57,000	293,000
Net operating loss carry forwards	123,434,000
Tax benefits carry forward	25,921,000
Foreign
Deferred tax liabilities:
Net deferred tax liabilities		$ (134,000)
State
Deferred tax liabilities:
Tax benefits carry forward	$ 1,692,000