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Note 15 - Quarterly Financial Information (unaudited) (Details) - Quarterly Financial Information (unaudited) (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Quarterly Financial Information (unaudited) [Abstract]                      
Revenue   $ 2,948us-gaap_Revenues             $ 2,948us-gaap_Revenues    
Operating expenses 3,273us-gaap_OperatingExpenses 2,814us-gaap_OperatingExpenses 2,508us-gaap_OperatingExpenses 1,933us-gaap_OperatingExpenses 1,788us-gaap_OperatingExpenses 1,914us-gaap_OperatingExpenses 1,549us-gaap_OperatingExpenses 1,871us-gaap_OperatingExpenses 10,528us-gaap_OperatingExpenses 7,122us-gaap_OperatingExpenses 7,996us-gaap_OperatingExpenses
Net (loss) income 7,233us-gaap_NetIncomeLoss (5,181)us-gaap_NetIncomeLoss (2,563)us-gaap_NetIncomeLoss (2,831)us-gaap_NetIncomeLoss (2,397)us-gaap_NetIncomeLoss (2,103)us-gaap_NetIncomeLoss (1,547)us-gaap_NetIncomeLoss (1,865)us-gaap_NetIncomeLoss (3,342)us-gaap_NetIncomeLoss (7,912)us-gaap_NetIncomeLoss (7,970)us-gaap_NetIncomeLoss
Net (loss) income attributable to common stockholders - basic 5,938us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic (7,458)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic (4,460)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic (4,343)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic (3,937)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic (3,643)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic (3,074)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic (3,377)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic (9,695)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic (14,031)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic (14,103)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
Net (loss) income attributable to common stockholders - diluted $ 5,938us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted $ (7,458)us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted $ (4,460)us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted $ (4,343)us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted $ (3,937)us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted $ (3,643)us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted $ (3,074)us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted $ (3,377)us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted      
Net (loss) income per share attributable to common stockholders:                      
Basic (in Dollars per share) $ 0.52us-gaap_IncomeLossFromContinuingOperationsPerBasicShare $ (31.00)us-gaap_IncomeLossFromContinuingOperationsPerBasicShare [1] $ (18.55)us-gaap_IncomeLossFromContinuingOperationsPerBasicShare $ (18.09)us-gaap_IncomeLossFromContinuingOperationsPerBasicShare $ (16.41)us-gaap_IncomeLossFromContinuingOperationsPerBasicShare $ (15.21)us-gaap_IncomeLossFromContinuingOperationsPerBasicShare [1] $ (13.33)us-gaap_IncomeLossFromContinuingOperationsPerBasicShare $ (14.64)us-gaap_IncomeLossFromContinuingOperationsPerBasicShare      
Diluted (in Dollars per share) $ 0.48us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare $ (31.00)us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare [1] $ (18.55)us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare $ (18.09)us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare $ (16.41)us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare $ (15.21)us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare [1] $ (13.33)us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare $ (14.64)us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare      
Weighted-average common shares outstanding used in net (loss) income per share attributable to common stockholders:                      
Basic (in Shares) 11,444,807us-gaap_WeightedAverageNumberOfSharesOutstandingBasic [2] 240,610us-gaap_WeightedAverageNumberOfSharesOutstandingBasic [1] 240,374us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 240,138us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 239,902us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 239,472us-gaap_WeightedAverageNumberOfSharesOutstandingBasic [1] 230,607us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 230,607us-gaap_WeightedAverageNumberOfSharesOutstandingBasic      
Diluted (in Shares) 12,295,431us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding [2] 240,610us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding [1] 240,374us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 240,138us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 239,902us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 239,472us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding [1] 230,607us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 230,607us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding      
[1] Adjusted to correct an immaterial error in the weighted-average share calculation in the Company's Form 10-Q as of September 30, 2014 and 2013.
[2] In October 2014, the Company completed its initial public offering of common stock which resulted in net proceeds of approximately $62.5 million from the issuance of 7,026,500 shares of common stock, which includes the sale of 916,500 shares under the underwriter's over allotment option. Immediately prior to the closing of the Company's IPO, 498,889 shares of Common Stock were issued upon the exercise of warrants with aggregate proceeds of $1.4 million. In connection with the public offering, all of the Company's outstanding redeemable convertible preferred stock was converted to 8,651,805 shares of common stock.