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Significant Accounting Policies - Goodwill (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2016 USD ($)
Goodwill [Line Items]
Balance as of the beginning of the period	$ 6,800
Acquisition (see Note 3)	14,242
Measurement period adjustments	(298)
Balance as of the end of period	20,744
Goodwill and intangible assets impairment	$ 0
Minimum [Member]
Long-Term Liabilities
Lease Term	5 years
Maximum [Member]
Long-Term Liabilities
Lease Term	10 years

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Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (a)
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Total loss recognized during the period from the impairment of goodwill plus the loss recognized in the period resulting from the impairment of the carrying amount of intangible assets, other than goodwill.

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