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Fair Value Measurements - Schedule of Assets Carried at Fair Value (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Money market funds
Assets
Cash equivalents	$ 20,092	$ 20,069
Money market funds | Level 1
Assets
Cash equivalents	20,092	20,069
Money market funds | Level 3
Assets
Cash equivalents	0	0
Embedded conversion option held for investment
Assets
Embedded conversion option held for investment	984	873
Embedded conversion option held for investment | Level 1
Assets
Embedded conversion option held for investment	0	0
Embedded conversion option held for investment | Level 3
Assets
Embedded conversion option held for investment	$ 984	$ 873

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Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

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Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset.

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