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Summary of Significant Accounting Policies (Tables)
3 Months Ended
Mar. 31, 2017
Accounting Policies [Abstract]  
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis
Assets and liabilities measured at fair value on a recurring basis consisted of the following:
 
March 31, 2017
 
December 31, 2016
 
Level 1
 
Level 3
 
Level 1
 
Level 3
 
(in thousands)
Assets:
 
 
 
 
 
 
 
Money market funds (included in cash and cash equivalents)
$
53,898

 
$

 
$
22,189

 
$

Liabilities:
 
 
 
 
 
 
 
Preferred and common stock warrants (included in accrued and other liabilities)
$

 
$
82

 
$

 
$
133

Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation
A reconciliation of the beginning and ending balances of Miragen’s liabilities measured at fair value using significant unobservable, or Level 3, inputs are as follows for the three months ended March 31, 2017 (in thousands):
Balance of liability as of December 31, 2016
$
133

Reclassification of preferred stock warrant to common stock warrant
(51
)
Balance of liability as of March 31, 2017
$
82