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Subsequent Events	12 Months Ended
	Dec. 31, 2017
Subsequent Events [Abstract]
Subsequent Events	21. Subsequent Events Subsequent events have been evaluated through March 14, 2018, the original issuance date of this report. On January 17, 2018, we announced the confidential submission of a draft registration statement on Form S-1 to the SEC relating to the proposed initial public offering of our common stock. The number of shares of common stock to be sold and the price range for the proposed offering have not yet been determined.

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- Definition

The entire disclosure for significant events or transactions that occurred after the balance sheet date through the date the financial statements were issued or the date the financial statements were available to be issued. Examples include: the sale of a capital stock issue, purchase of a business, settlement of litigation, catastrophic loss, significant foreign exchange rate changes, loans to insiders or affiliates, and transactions not in the ordinary course of business.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 855
-URI http://asc.fasb.org/topic&trid=2122774

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