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Amount 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. Excludes cash and cash equivalents within disposal group and discontinued operation.

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Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

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The amount by which the fair value of an investment is less than the amortized cost basis or carrying amount of that investment at the balance sheet date and the decline in fair value is deemed to be other than temporary, before considering whether or not such amount is recognized in earnings or other comprehensive income.

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Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

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The net realized gains or losses on investments during the period, not including gains or losses on securities separately or otherwise categorized as trading, available-for-sale, or held-to-maturity.

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Summary of significant accounting policies (Details)		6 Months Ended	12 Months Ended
Summary of significant accounting policies (Details)	Jun. 27, 2016 $ / shares	Jun. 30, 2016 USD ($) segment	Dec. 31, 2015 USD ($)
Segment information
Number of operating segment \| segment		1
Cash equivalents and short term investments
Realized gains or losses on sale of investments		$ 0	$ 0
Investments adjusted for other than temporary declines in fair value		$ 0	$ 0
Fair value of financial instruments
Effective interest rate		12.40%
Warrants
Convertible preferred stock underlying share fair value price \| $ / shares	$ 14.00
Furniture
Property, Plant and Equipment [Line Items]
Estimated useful lives		7 years
Equipment
Property, Plant and Equipment [Line Items]
Estimated useful lives		5 years
Office equipment
Property, Plant and Equipment [Line Items]
Estimated useful lives		3 years
Rubles
Concentrations of credit risk and off-balance sheet risk
Cash		$ 3,500,000
U S dollars
Concentrations of credit risk and off-balance sheet risk
Cash		$ 3,000,000