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Summary of Significant Accounting Policies (Revised Condensed Consolidated Statements of Operations) (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2020
Mar. 31, 2020
Jun. 30, 2019
Mar. 31, 2019
Jun. 30, 2020
Jun. 30, 2019
Revenue:            
Total revenue $ 17,405   $ 19,895   $ 35,295 $ 37,886
Operating costs and expenses:            
Cost of rentals, exclusive of depreciation stated separately below 6,629   6,613   14,526 12,833
Depreciation and amortization 6,301   5,720   12,541 11,297
Total operating costs and expenses 17,553   19,593   35,716 37,729
Operating income (loss) (148)   302   (421) 157
Income before provision for income taxes 222   479   (239) 635
Income tax (expense) benefit (57)   (152)   4,486 (210)
Net income (loss) $ 165 $ 4,082 $ 327 $ 98 $ 4,247 $ 425
Earnings (loss) per share, basic (in USD per share) $ 0.01   $ 0.02   $ 0.32 $ 0.03
Earnings (loss) per share, diluted (in USD per share) $ 0.01   $ 0.02   $ 0.32 $ 0.03
As Reported            
Revenue:            
Total revenue     $ 19,895     $ 37,886
Operating costs and expenses:            
Cost of rentals, exclusive of depreciation stated separately below     6,359     12,244
Depreciation and amortization     5,683     11,241
Total operating costs and expenses     19,302     37,084
Operating income (loss)     593     802
Income before provision for income taxes     770     1,280
Income tax (expense) benefit     (197)     (350)
Net income (loss)     $ 573 357   $ 930
Earnings (loss) per share, basic (in USD per share)     $ 0.04     $ 0.07
Earnings (loss) per share, diluted (in USD per share)     $ 0.04     $ 0.07
Revisions | Revision of Prior Period Financial Statements            
Revenue:            
Total revenue     $ 0     $ 0
Operating costs and expenses:            
Cost of rentals, exclusive of depreciation stated separately below     254     589
Depreciation and amortization     37     56
Total operating costs and expenses     291     645
Operating income (loss)     (291)     (645)
Income before provision for income taxes     (291)     (645)
Income tax (expense) benefit     45     140
Net income (loss)     $ (246) $ (259)   $ (505)
Earnings (loss) per share, basic (in USD per share)     $ (0.02)     $ (0.04)
Earnings (loss) per share, diluted (in USD per share)     $ (0.02)     $ (0.04)