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Accrued expenses and other current liabilities, other non-current expenses | 6 Months Ended
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Jun. 30, 2019
Accrued expenses and other current liabilities, other non-current expenses | 6 Accrued expenses and other current liabilities ​ Accrued expenses and other current liabilities include the following items: ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | June 30, | ​ | December 31,
​ |  | 2019 |  | 2018
​ | ​ | (in thousands)
Accruals for services provided by vendors-not yet billed | ​ | $ | 2,933 | ​ | $ | 1,999
Personnel related accruals and liabilities | ​ | ​ | 4,433 | ​ | ​ | 5,688
Derivative financial liability warrants | ​ | ​ | — | ​ | ​ | 545
Total | ​ | $ | 7,366 | ​ | $ | 8,232
​

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- Definition The entire disclosure for accounts payable and accrued liabilities at the end of the reporting period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(a),20,24) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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Namespace Prefix: | us-gaap_
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