Related Party Transactions - Rental agreement (Details) - Office Rental	3 Months Ended
Mar. 31, 2017 USD ($) item	Mar. 31, 2016 USD ($) item
Related Party Transactions
Rent expense \| $	$ 26,000	$ 8,000
LLC owned by two officers
Related Party Transactions
Number of officers \| item	1	1
Number of former officers \| item	1	1
Rent expense \| $	$ 0	$ 8,000

Expenses recognized resulting from transactions (excluding transactions that are eliminated in consolidated or combined financial statements) with related party.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 850
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864

Name:	us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration