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Accounts Payable - Summary of Accounts Payable (Detail) (USD $)
Dec. 31, 2014
Dec. 31, 2013
Accounts Payable [Abstract]    
External services $ 1,352,710stem_AccountsPayableExternalServices $ 863,030stem_AccountsPayableExternalServices
Supplies 339,762us-gaap_ConstructionPayableCurrentAndNoncurrent 263,866us-gaap_ConstructionPayableCurrentAndNoncurrent
Other 126,359us-gaap_AccountsPayableOtherCurrentAndNoncurrent 25,007us-gaap_AccountsPayableOtherCurrentAndNoncurrent
Total accounts payable $ 1,818,831us-gaap_AccountsPayableCurrentAndNoncurrent $ 1,151,903us-gaap_AccountsPayableCurrentAndNoncurrent