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Revision of Prior Period Financial Statements - Schedule of Financial Statement Line Item Correction of the Amounts Previously Reported to the Revised Amounts (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Jun. 30, 2019
Jun. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]                          
Total revenue                     $ 25,317 $ 16,447  
Interest (expense) $ (170) $ (116) $ (18) $ (9) $ (63) $ (11) $ (134) $ (74) $ (304) $ (83) (474) (90)  
Income tax (expense) benefit       528 495     495   1,023 (2) 1,062  
Net income (loss) (627) (237) 85 (1,828) (1,041) (710) (152) (1,751) (779) (3,579) 893 (4,385)  
Notes payable - due to affiliates, net of discount 5,683 5,702 5,734 5,700 5,721 17,237 5,702 5,721 5,683 5,700 5,706 5,716  
Additional paid-in capital 199,209 198,358 181,728 181,683 182,092 177,747 198,358 182,092 199,209 181,683 199,372 181,632  
Accumulated deficit (196,872) (196,245) (196,008) (195,287) (193,458) (192,417) (196,245) (193,458) (196,872) (195,287) (195,198) (196,091)  
Total equity 6,519 6,295 6,296 6,796 10,471 228 6,295 10,471 6,519 6,796 8,357 5,817 $ 707
As Previously Reported [Member]                          
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]                          
Interest (expense) (186) (132) (34) (25) (24) (24) (166) (48) (352) (73)   (97)  
Income tax (expense) benefit       445 495     495   940   938  
Net income (loss) (643) (253) 69 (1,927) (1,002) (723) (184) (1,725) (827) (3,652)   (4,516)  
Notes payable - due to affiliates, net of discount 4,981 4,984 4,935 4,869 4,874 15,346 4,984 4,874 4,981 4,869   4,903  
Additional paid-in capital 198,184 197,333 180,769 180,683 181,009 177,747 197,333 181,009 198,184 180,683   180,673  
Accumulated deficit (195,146) (194,503) (194,250) (193,456) (191,528) (190,526) (194,503) (191,528) (195,146) (193,456)   (194,319)  
Total equity 7,221 7,013 7,095 7,627 11,318 2,119 7,013 11,318 7,221 7,627   6,630  
Adjustment [Member]                          
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]                          
Interest (expense) 16 16 16 16 (39) 13 32 (26) 48 (10)   7  
Income tax (expense) benefit       83           83   124  
Net income (loss) 16 16 16 99 (39) 13 32 (26) 48 73   131  
Notes payable - due to affiliates, net of discount 702 718 799 831 847 1,891 718 847 702 831   813  
Additional paid-in capital 1,025 1,025 959 1,000 1,083   1,025 1,083 1,025 1,000   959  
Accumulated deficit (1,726) (1,742) (1,758) (1,831) (1,930) (1,891) (1,742) (1,930) (1,726) (1,831)   (1,772)  
Total equity (702) (718) (799) (831) (847) (1,891) (718) (847) (702) (831)   (813)  
Asset Management [Member]                          
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]                          
Total revenue 4,780 4,450 4,211 3,085 3,184 2,791 8,661 5,975 13,441 9,060 19,605 13,416  
Direct costs 4,197 3,940 3,667 2,813 2,830 2,541 7,607 5,371 11,804 8,184 $ 16,561 12,234  
Asset Management [Member] | As Previously Reported [Member]                          
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]                          
Total revenue 4,293 4,024 3,861 2,730 2,960 2,791 7,885 5,751 12,178 8,481   12,473  
Direct costs 3,710 3,514 3,317 2,458 2,606 $ 2,541 6,831 5,147 10,541 7,605   11,291  
Asset Management [Member] | Adjustment [Member]                          
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]                          
Total revenue 487 426 350 355 224   776 224 1,263 579   943  
Direct costs $ 487 $ 426 $ 350 $ 355 $ 224   $ 776 $ 224 $ 1,263 $ 579   $ 943