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Summary of Significant Accounting Policies - New Accounting Principles (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Jan. 01, 2019
New Accounting Principles
Right-of-use assets	$ 2,300
Operating lease liabilities	$ 2,347
Accounting Standards Update 2016-02 | Adjustment
New Accounting Principles
Right-of-use assets		$ 2,300
Operating lease liabilities		$ 2,300

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Present value of lessee's discounted obligation for lease payments from operating lease.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 45
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Amount of lessee's right to use underlying asset under operating lease.

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