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Financial instruments (Details) - USD ($) | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Recurring |  |  |
Restricted cash |  | $ 0 | $ 428,203
Certificate of deposit |  | 0 | 5,637,538
Net put/call option liability | [1] | 680,000 | 0
Total assets recurring |  |  | 6,065,741
Fair Value, Inputs, Level 1 [Member] |  |  |
Recurring |  |  |
Restricted cash |  |  | 428,203
Certificate of deposit |  |  | 0
Net put/call option liability |  | 0 |
Total assets recurring |  |  | 428,203
Fair Value, Inputs, Level 2 [Member] |  |  |
Recurring |  |  |
Restricted cash |  |  | 0
Certificate of deposit |  |  | 5,637,538
Net put/call option liability |  | 0 |
Total assets recurring |  |  | 5,637,538
Fair Value, Inputs, Level 3 [Member] |  |  |
Recurring |  |  |
Restricted cash |  |  | 0
Certificate of deposit |  |  | 0
Net put/call option liability |  | $ 680,000 |
Total assets recurring |  |  | $ 0
[1] | The net liability arising from the put/call options is included other liabilities in the accompanying condensed consolidated balance sheets as of December 31, 2016.

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- Definition A savings certificate entitling the Entity (that is, bearer) to receive interest at an established maturity date, based upon a fixed interest rate. A certificate of deposit may be issued in any denomination. Certificates of deposit are generally issued by commercial banks and, therefore, insured by the FDIC (up to the prescribed limit). Certificates of deposit generally restrict holders from withdrawing funds on demand without the incurrence of penalties. Generally, only certificates of deposit with original maturities of three months or less qualify as cash equivalents. Original maturity means original maturity to the entity holding the investment. As a related example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three-years ago does not become a cash equivalent when its remaining maturity is three months. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash Equivalents -URI http://asc.fasb.org/extlink&oid=6507016 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Fair value of financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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- Definition The carrying amounts of cash and cash equivalent items which are restricted as to withdrawal or usage. Restrictions may include legally restricted deposits held as compensating balances against short-term borrowing arrangements, contracts entered into with others, or entity statements of intention with regard to particular deposits; however, time deposits and short-term certificates of deposit are not generally included in legally restricted deposits. Excludes compensating balance arrangements that are not agreements which legally restrict the use of cash amounts shown on the balance sheet. For a classified balance sheet represents the current portion only (the noncurrent portion has a separate concept); there is a separate and distinct element for unclassified presentations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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