Related-Party Transactions - Receivable and Payable Balance with Affiliates (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Receivable and Payable Balances with Affiliates
Receivable balances with affiliates	$ 866	$ 716
Increase to related party payables	1,323	1,740
HOV Services, Ltd
Receivable and Payable Balances with Affiliates
Receivable balances with affiliates	603	601
Rule 14, LLC
Receivable and Payable Balances with Affiliates
Receivable balances with affiliates	263
Increase to related party payables		250
HGM
Receivable and Payable Balances with Affiliates
Receivable balances with affiliates		115
Increase to related party payables	20
Apollo
Receivable and Payable Balances with Affiliates
Increase to related party payables		202
Oakana Holdings Inc
Receivable and Payable Balances with Affiliates
Increase to related party payables	16	1
Ex-Sigma
Receivable and Payable Balances with Affiliates
Increase to related party payables	$ 1,287	$ 1,287

The aggregate amount of receivables to be collected from related parties where one party can exercise control or significant influence over another party; including affiliates, owners or officers and their immediate families, pension trusts, and so forth, at the financial statement date. which are usually due within one year (or one business cycle).

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08(k)(1))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(11))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(3)(a)(2))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section 45
-Paragraph 1
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=118951113&loc=d3e6676-107765

Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 850
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864

Name:	us-gaap_DueFromRelatedPartiesCurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant